<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    div:nth-child(1){
        width: 200px;
        height: 200px;
        background-color: pink;
        padding: 10px;
        box-sizing: border-box;
    }
</style>
<body>
<div></div>
</body>
</html>